Method for coloring cellulose fiber and colored cellulose fiber obtained thereby

Abstract

A method for producing a colored cellulose fiber, comprising: a step (1) of introducing a carboxylic group or a sulfonic acid group into cellulose fiber, and a step (2) of treating the cellulose fiber having the carboxylic group or the sulfonic acid group introduced with an aromatic derivative having one or more hydroxyl groups and a metal salt simultaneously or separately, and a colored cellulose fiber produced by the same method.

1. A method for coloring a cellulose fiber, comprising:
 a step (1) of introducing a carboxylic group into cellulose fiber; and a step (2) of treating the cellulose fiber having the carboxylic group introduced with an aromatic derivative having one or more hydroxyl groups selected from dihydroxybenzoic acid, dihydroxybenzaldehyde, trihydroxybenzoic acid or trihydroxybenzaldehyde and a metal salt, wherein the metal salt is an iron salt, simultaneously or separately; 
 wherein the cellulose fiber is colored without the use of a dye. 
 
     
     
       2. The method for coloring a cellulose fiber according to  claim 1 , wherein carboxylic groups are introduced into the cellulose fiber by an adhesion curing treatment with a polycarboxylic acid. 
     
     
       3. The method for coloring a cellulose fiber according to  claim 1 , wherein a carboxylic group is introduced into the cellulose fiber by irradiating the fiber with an electron beam or gamma ray. 
     
     
       4. The method for coloring a cellulose fiber according to  claim 1 , wherein a carboxylic group is introduced into the cellulose fiber by immobilization with urethane resins, glyoxal resins or acrylic resins as a binder. 
     
     
       5. The method for coloring a cellulose fiber according to  claim 1 , wherein treatment with a metal salt is performed by immersion or spraying. 
     
     
       6. The method for coloring a cellulose fiber according to  claim 1 , wherein treatment with an aromatic derivative having one or more hydroxyl groups is performed by immersion or spraying. 
     
     
       7. The method for coloring a cellulose fiber according to  claim 2 , wherein the adhesion amount of the polycarboxylic acid is from 0.1 to 30 wt %. 
     
     
       8. A method for producing a colored cellulose fiber, comprising:
 a step (1) of introducing a carboxylic group into a cellulose fiber; and 
 a step (2) of treating the cellulose fiber having the carboxylic group introduced with an aromatic derivative having one or more hydroxyl groups selected from dihydroxybenzoic acid, dihydroxybenzaldehyde, trihydroxybenzoic acid or trihydroxybenzaldehyde and a metal salt, wherein the metal salt is an iron salt, simultaneously or separately; 
 wherein the cellulose fiber is colored without the use of a dye. 
 
     
     
       9. The method for producing a colored cellulose fiber according to  claim 8 , wherein carboxylic groups are introduced into the cellulose fiber by an adhesion curing treatment with a polycarboxylic acid. 
     
     
       10. The method for producing a colored cellulose fiber according to  claim 8 , wherein a carboxylic group is introduced into the cellulose fiber by irradiating the fiber with an electron beam or gamma ray. 
     
     
       11. The method for producing a colored cellulose fiber according to  claim 8 , wherein a carboxylic group is introduced into the cellulose fiber by immobilization with urethane resins, glyoxal resins or acrylic resins as a binder. 
     
     
       12. The method for producing a colored cellulose fiber according to  claim 8 , wherein treatment with a metal salt is performed by immersion or spraying. 
     
     
       13. The method for producing a colored cellulose fiber according to  claim 8 , wherein treatment with an aromatic derivative having one or more hydroxyl groups is performed by immersion or spraying.